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STEAM BOILER FURNAGE. Y No. 000,003. Patented Mar. 15,1808.

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STEAM BOILBR FURNAE. No. 600,603. Patented Mar. 15,189'8.

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UNrTnD STATES PATENT OFFICE.

CLOVIS N. BACON,` OF BOSTON, MASSACHUSETTS, ASSIGNOR TO TIIEODORE A. DODGE, TRUSTEE, OF SAME PLACE.

-STEAM-BOILER FU RNACE.

SPECIFICATION- forming part of Letters Patent N 0. 600,603, dated. March 15, 1898. Application led December 28, 1896. Serial No. 617,159. (No model.)

To all whom it may concern:

Be it known that I, OLovIs N. BACON, of Boston, in the county of Suffolk and State of Massaehusetts,have invented certain new and useful Improvements in Steam-Boiler and other Furnaces, of which the following is a specification.

The object of my invention is to provide a means for burning coal without making smoke 1o and so as to utilize the gases that are lost when the ordinary furnaces are used.

My invention is applicable to all kinds of horizontal boilers, as well as locomotive, marine, and upright boilers, and, in fact, to all furnaces, and it is designed by me to make use of the highest rate of combustion that can be obtained. The objections arising from the use of cheap coal, such as smoke and elinkers, I also design to overcome and to increase zo the efficiency of the boiler by procuring the highest evaporation.

Figure l is a longitudinal section of a tubular boiler embodying my invention. Fig. 2 is a vertical cross-section of the same, taken on the dotted lines 2 2 of Fig. l. Fig. 3 is a similar View taken on the dotted line 3 3 of Fig. l. Fig. 4. is a vertical longitudinal section of a Babcock & Wilcox boiler, which embodies my invention.

3o I accomplish the objects mentioned by the use of tiles placed a suitable distance above the grate-bars, having holes preferably placed at different angles, through which atmospheric air is forced or blown upon the coal,

3 5 and also by the use of combustion-chambers, through which the heated air and smoke pass', so placed that a large part of the heat which they contain is utilized. The greater part of the air required for the combustion of the coal is usually supplied to the tiles and forced down into the coal and a less amount of air is supplied under the grate. Different coals may require different proportions of air to be supplied from above and below.

I design to build my furnace for stationary boilers of brick, as generally used in the setting of boilers, and to employ in addition perforated tiles of fire-brick shapes and to place the tiles in a suitable position to conduct and 5o mingle the atmospheric air under pressure with the coal and the gases.

I design to use grates of the usual construction, which I vary according to the fuel burned, and I use tiles made of benezette, plumbago, and German clay, or any vother suitable material. The tiles are made on an angle, as shown in Fig. l of the drawings, hereinafter to be referred to, orthey may be made straight, if desired. The perforations in the tiles may be' made on different angles 6o to each other, so as to distribute the air to all parts of the furnace. In all furnaces where it can be readily built I use a second combustion-chamber for the purpose of retarding the heat and supplying it to the shell of the boiler a longer time than can be done with the ordinary setting, thus allowing the boiler to absorb-the heat instead of passing it up the chimney. In horizontal, tubular, and Heines boilers this second combustion-chamber is 7o built back of the bridge-Wall, and in Babcock da Wilcox boilers it is built above the tubes, as shown in Fig. 4 of the drawings.

a is the ash-pit.

b is the grate-bars, as in ordinary boilers.

d is a slanting or straight tile placed on the bridge-wall e, running across the furnace and slanting forward. The shoulder a: is formed upon the bridge-wall at its upper edge, and the tile ol is placed thereon, its lower edge be- 8o ing formed at such an angle that the tile is inclined forwardly at a suitable angle over the fire for the purpose of enabling the currents of air to be forced through its openings at different angles upon the lire.

In order to secure the tile in place, a iianged plate m is placed both upon the top of the bridge-wall and tile, and the iiange upon the plate catches in a corresponding groove in the top edge of the tile, so as to secure it in posi- 9o tion. Upon the top of this plate, if there is room, may be built a portion of the bridgewall, so as to anchor the plate securely in position and out of the direct effects of the heat. The tiles are formed of sufficient thickness to enable the perforations through it to direct the air in the desired direction.

f is a similar tile placed on each side of the space above the lire-box similarly to the tile d, and it extends from the bridge-wall e to roo the front of the furnace. These tiles on the sides of the fire-chamber are supported upon shoulders in the side walls and are anchored in place by angular flanged plates m or by other suitable means. These tiles are placed a suitable distance above the grate-bars and are perforated with holes from one-fourth to one-half an inch in diameter. These holes are preferably placed at different angles to each other, as shown in Fig. l. Atmospheric air is supplied to the tiles ci and ffrom a blower placed either at the back, front, or side of the boiler or furnace, or in any other suitable way. This air is taken from over the boiler or from any other suitable place and is drawn thence down .and passes through the blower, then forced back over the boiler, thence to the small conducting-pipe n, to the chamber o, and distributed to the tiles d and f, through which it passes, as above explained, and also under the grate. Exhaust-steam from the engine, if one is required to run the blower, may be emptied into the pipe from the blower. A pressure of from one to six ounces of air is used, so as to force it to all parts of the furnace. In this way any temperature of fire required can be obtained.

The second combustion or retarding chamber gis formed by building a long arch h, Fig. 1, from theback of the boiler to within a suitable distance-say twelve or fourteen inches-of the bridge-wall e. It is made of firebrick or any suitable material. In the ordinary boiler-furnace it is from twenty-four to thirty inches below the boiler. At the back end of the arch h the wall t' is built up around the boiler. At the top and back of the bridgewall is the arch j, extending back from the bridge-wall e a suitable distance, which is about thirty inches in ordinary furnaces. This arch is made imperforate, so that no portion of the products of combustion can pass through it, and is made to extend to a position with reference to the front edge of the arch h such that the products of combustion will be forced backward against the wall 'L' before they can turn downward and forward to make their escape through the opening 7a. In this way the flame and gases are carried back of the boiler. Then they flow forward over the arch h, Fig. l, and under the arch j to the opening Zo, then down and back under the arch h, then upward to the tubes or flues. The top of these tiles d f and the space back of them are covered with iron plates or special tiles doweled into them, so as to hold them firmly in place and making a tight chamber, so that no air can get out except through the perforations.

Where a Babcock 85 Wilcox boiler is used, as shown in Fig. 4, the fire-box is constructed the same as in the case of a horizontal boiler, as shown in Figs. l and 2. The combustion or retarding chamber gis built above the line of tubes, as shown in Fig. 4.

The gases passing upward between the tubes ,instead of immediately turning down, as in ordinaryboilers, are carried up and around the boiler a, then back, and then forward and downward, as usual.

What I claim, and desire to secure by Letters Patent, is

1. In a furnace, the bridge-wall, provided with a shoulder, and the side walls of the furnace provided with corresponding shoulders, and the tiles provided with a series of perforations for the escape of the air, combined with the air-chambers back of the tiles, and the flanged plates which catch in the tops of the tiles, and secure them in position, substantially as shown.

2. In a furnace, the bridge-wall, the imperforate arch 7' extending backwardly therefrom, and the wall t', combined with the chamber g and the arch h extending forwardly from the wall t', beyond the rear edge of the arch j, whereby the products of combustion are forced rearwardly the full length of the chamber, before they turn downwardly and forward toward the openings k, substantially as described.

CLOVIS N. BACON.

Witnesses:

MINA H. KELLEY, CHAs. H. DREW. 

